Rechargeable battery
A rechargeable battery includes: an electrode assembly including a first electrode, a second electrode, and a separator disposed between the first electrode and the second electrode; a case including an opening disposed in one side and receiving the electrode assembly; a cap assembly combined to the opening and closing and sealing the case; a first electrode tab extending from the first electrode and combined to the case; and a second electrode tab extending from the second electrode and combined to the cap assembly, wherein the cap assembly includes a first metal layer contacting the second electrode tab, a second metal layer spaced from the first metal layer and contacting the case, and a first plastic portion insulating between the first metal layer and the second metal layer.
1 . A rechargeable battery comprising:
an electrode assembly including a first electrode, second electrode, and a separator between the first electrode and the second electrode;
a case including an opening in one side and wherein the electrode assembly is received in the case;
a cap assembly at the opening and closing and sealing the case;
a first electrode tab extending from the first electrode and connected to the case; and
a second electrode tab extending from the second electrode and connected to the cap assembly,
wherein the cap assembly comprises:
a first metal layer contacting the second electrode tab,
a second metal layer spaced from the first metal layer and contacting the case, and
a first plastic portion insulating the first metal layer from the second metal layer, and
wherein the cap assembly further comprises a second plastic portion surrounding an external edge of the second metal layer, and the case further comprises a third plastic portion surrounding a side wall of the case and bonded to the second plastic portion, and
wherein one of the second plastic portion or the third plastic portion has greater transparency than the other.
2 . The rechargeable battery of claim 1 , wherein
the second metal layer has a ring shape, and
an internal edge of the second metal layer surrounds an external edge of the first metal layer.
3 . The rechargeable battery of claim 2 , wherein
the external edge of the first metal layer has a reverse staircase form, and
the internal edge of the second metal layer has a staircase form.
4 . A rechargeable battery comprising:
an electrode assembly including a first electrode, second electrode, and a separator between the first electrode and the second electrode;
a case including an opening in one side and wherein the electrode assembly is received in the case;
a cap assembly at the opening and closing and sealing the case;
a first electrode tab extending from the first electrode and connected to the case; and
a second electrode tab extending from the second electrode and connected to the cap assembly
wherein the cap assembly comprises:
a first metal layer contacting the second electrode tab,
a second metal layer spaced from the first metal layer and contacting the case, and
a first plastic portion insulating the first metal layer from the second metal layer, and
wherein upper surfaces of each of the first metal layer, the first plastic portion, and the second metal layer are on a same plane.
5 . The rechargeable battery of claim 1 , wherein
the second metal layer is not bonded to the side wall of the case.
6 . The rechargeable battery of claim 1 , wherein
the external edge of the second metal layer has a staircase form.
7 . The rechargeable battery of claim 1 , wherein
the second plastic portion extends in a lower direction from the external edge of the second metal layer and covers an upper terminal of the side wall of the case, and
the third plastic portion is disposed lower than the upper terminal of the side wall.
8 . The rechargeable battery of claim 7 , wherein
the second plastic portion completely covers the external edge of the second metal layer and the upper terminal of the side wall of the case.
9 . The rechargeable battery of claim 7 , wherein
the second metal layer contacts the upper terminal of the side wall of the case.
10 . The rechargeable battery of claim 1 , wherein
a space between the second plastic portion and the third plastic portion is fused by use of laser beams.
11 . The rechargeable battery of claim 1 , wherein
the first metal layer has a same polarity as the second electrode, and
the second metal layer has a same polarity as the first electrode.
12 . The rechargeable battery of claim 1 , wherein
an upper side of the electrode assembly faces the cap assembly, and a lower side thereof faces a bottom portion of the case,
the first electrode tab extends from the lower side of the electrode assembly and is connected to the bottom portion of the case, and
the second electrode tab extends from the upper side of the electrode assembly and is connected to the first metal layer of the cap assembly.
13 . The rechargeable battery of claim 1 , wherein
the rechargeable battery has a ratio of a height to a diameter that is equal to or less than 1.